Cleaning method and system for papermaking dry net

Abstract

The invention relates to the technical field of dry net cleaning, and discloses a papermaking dry net cleaning method which comprises the following steps: firstly, utilizing a water pump to generate flushing water flow, spraying the flushing water flow to a dry net through a nozzle, and then sucking and discharging dirt separated from the dry net after flushing through a dirt collecting and discharging module arranged below the nozzle; meanwhile, cleaning effect parameters of the dry net are detected through the detection module, detected data are transmitted to the control module, and the control module adjusts the output pressure and flow of the water pump and the spraying angle of the nozzle according to the cleaning effect parameters and adjusts the suction force of the dirt collecting and discharging module according to the dirt suction amount of the dirt collecting and discharging module. For impurity deposition and blockage on the dry net, high-pressure flushing water flow is generated through the water pump and then sprayed to the dry net through the nozzle, and the dirt collecting and discharging module sucks and discharges the dirt after cleaning, so that the drying efficiency is improved, energy is saved, consumption is reduced, and the operating efficiency of the paper machine is improved while the air permeability of the dry net is improved.

Description

Technical Field

[0001] The invention relates to the technical field of dryer fabric cleaning, and in particular to a cleaning method and system for a papermaking dryer fabric. Background Art

[0002] With the rapid development of the papermaking industry, the increase in the number of times waste paper is recycled, and the express packaging industry has developed rapidly, a large amount of sealing tape is used in packaging cartons, resulting in more and more impurities in waste paper raw materials, which increases the amount of harmful substances entering the paper machine system, increases processing energy consumption, and increases production costs.

[0003] Among them, some impurities will be deposited on the dryer mesh and clog the mesh, thus affecting the cleanliness of the dryer mesh; adhesives, paper fibers and other substances sticking to the dryer mesh will cause black spots on the surface of the paper sheets, paper breaks and product quality problems; and poor dryer mesh cleanliness will also lead to a series of problems such as poor air permeability, low efficiency and short service life of the dryer mesh, which will seriously affect the normal operation of the paper machine and the quality of the finished paper.

[0004] In actual production, most of the time, after the paper machine is shut down, a large amount of chemical agents and high-pressure washing are used manually to solve the problem of dryer fabric blockage. However, such manual treatment is time-consuming and labor-intensive, uneven cleaning will also cause pollution. Therefore, we propose a papermaking dryer fabric cleaning method and system to improve the drying efficiency and achieve the purpose of energy saving and consumption reduction. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for cleaning a papermaking dryer fabric. The impurity deposition and blockage on the dryer fabric are cleaned by a high-pressure nozzle and then sucked out by a dirt collection and drainage module, thereby improving the drying efficiency, saving energy and reducing consumption, and improving the air permeability of the dryer fabric while improving the operating efficiency of the paper machine.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A method for cleaning a papermaking dryer mesh comprises the following steps: first, a water pump is used to generate a flushing water flow, and the flushing water flow is sprayed toward the dryer mesh through a nozzle to continuously flush impurities deposited and blocked on the dryer mesh; then, a dirt collection and drainage module is arranged below the nozzle to suck in and discharge the dirt separated from the dryer mesh after flushing; at the same time, the cleaning effect parameters of the dryer mesh are detected by a detection module, and the detected data is transmitted to a control module, and the control module adjusts the output pressure and flow of the water pump and the spray angle of the nozzle according to the cleaning effect parameters, and adjusts its suction force according to the dirt suction amount of the dirt collection and drainage module.

[0007] Optionally, the cleaning effect parameters include residual dirt area, stain type and distribution position.

[0008] Optionally, the nozzle moves within a range of ±60 degrees in the horizontal direction and ±60 degrees in the longitudinal direction relative to the dryer web.

[0009] Optionally, the output pressure range of the water pump is 8-10 MPa, and the output flow range of the water pump is 30-50 L / min.

[0010] A cleaning system for a papermaking dryer fabric, comprising a water pump, a nozzle, a dirt collection and drainage module, a detection module and a control module, wherein the nozzle is arranged on one side of the dryer fabric, the dirt collection and drainage module is arranged below the nozzle, the detection module is located behind the dryer fabric cleaning area, and the water pump, the nozzle, the dirt collection and drainage module and the detection module are all connected to the control module.

[0011] Optionally, 5 to 10 nozzles are provided and distributed in a straight line on one side of the dryer net.

[0012] Optionally, the dirt collection and drainage module includes a collection pipe, a vacuum system and a collection device, and the collection pipe is located below the nozzle.

[0013] Optionally, the detection module adopts visual detection equipment.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) In the present invention, in order to solve the impurity deposition and blockage on the dryer fabric, a high-pressure flushing water flow is generated by a water pump, and then sprayed to the dryer fabric by a nozzle, and then sucked and discharged by the dirt collection and drainage module after cleaning, thereby improving the drying efficiency, saving energy and reducing consumption, and improving the air permeability of the dryer fabric while improving the operation efficiency of the paper machine; (2) In the present invention, the cleaning effect of the dryer net is detected by the detection module, and the data is fed back to the control module. The control module adjusts the spray angle of the nozzle, the output pressure and flow rate of the water pump, so as to realize real-time monitoring and automatic adjustment of the cleaning process, thereby ensuring the cleaning effect and reducing energy consumption; (3) In the present invention, the system parameters can be flexibly adjusted according to different dryer fabric materials, dirtiness and working environment, thereby improving the versatility of the technology; (4) In the present invention, each component of the cleaning system adopts a modular design, which is easy to install, maintain and replace, and is conducive to reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic flow chart of a method for cleaning a papermaking dryer fabric in an embodiment of the present invention; Figure 2 Schematic diagram of the structure of a cleaning system for a papermaking dryer fabric according to an embodiment of the present invention; DETAILED DESCRIPTION

[0016] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] Embodiment 1, as Figure 2 As shown, a cleaning system for a papermaking dryer fabric includes a water pump, a nozzle, a dirt collection and drainage module, a detection module and a control module. The nozzle is arranged on one side of the dryer fabric, the dirt collection and drainage module is arranged below the nozzle, the detection module is located behind the dryer fabric cleaning area, and the water pump, the nozzle, the dirt collection and drainage module and the detection module are all connected to the control module.

[0018] As mentioned above, the high-pressure water pump can suck ordinary water sources (such as tap water or pre-treated circulating water) into the pump body, and pressurize the water through the reciprocating motion of the plunger to achieve the set high-pressure output; the water pump here has an intelligent variable frequency speed regulation device, which can adjust the working parameters of the water pump in real time according to the instructions from the central control module, thereby accurately controlling the output pressure and flow of the high-pressure water pump.

[0019] Among them, the detection module adopts visual inspection equipment, adopts high-resolution industrial camera, with special image acquisition card and image processing software, and is set behind the dryer net cleaning area to ensure that the image of the dryer net surface can be clearly captured.

[0020] The industrial camera captures real-time images of the dryer surface at a set frame rate, and the captured images are transmitted to the image processing software through the image acquisition card. The software uses a deep learning-based image processing algorithm to identify and analyze the dirt in the image, calculate the residual dirt area, stain type and distribution on the dryer surface, and other parameters, and these parameters are fed back to the control module (i.e., the central control system) in real time.

[0021] There are 5 to 10 nozzles, which are distributed in a straight line on one side of the dryer net. The nozzles here are automatically angle-adjustable nozzles, which usually include a nozzle body, a rotating mechanism and an angle control device.

[0022] The nozzle body is responsible for spraying high-pressure water in a specific way. It adopts a special flow channel design inside, such as a multi-layer spiral guide structure, which allows the water flow to fully rotate and accelerate before spraying, and finally spray out in the form of concentrated, high-speed columnar water flow to enhance the impact on the dirt on the surface of the dry net.

[0023] The rotating mechanism is the core component for adjusting the nozzle angle. Common rotating mechanisms include motor-driven gear transmission devices or hydraulic-driven swing mechanisms. The motor-driven gear transmission device drives the gear to rotate through the motor, thereby rotating the nozzle around a specific axis; the hydraulic-driven swing mechanism uses the pressure of the hydraulic oil to push the piston, thereby driving the nozzle to swing.

[0024] The angle control device is a system based on sensors and controllers. The sensor can monitor the current angle of the nozzle in real time and feed the data back to the controller. The controller calculates the angle to be adjusted according to the preset program or the instructions received from the central control system, and controls the rotation mechanism to achieve precise adjustment of the nozzle angle.

[0025] The dirt collection and drainage module comprises a collection pipe, a vacuum system and a collection device, and the collection pipe is located below the nozzle.

[0026] Among them, the vacuum system uses a vacuum generator with adaptive pressure regulation function. The inner wall of the collection pipe is smooth and has good anti-clogging performance. The pipe connects the vacuum generator and the dirt collection device, and multiple suction ports are arranged near the bottom of the nozzle. The collection device adopts a dirt collection box with automatic cleaning function. A liquid level sensor and an automatic drain valve are arranged inside the dirt collection box. When the dirt liquid level in the dirt collection box reaches the preset height, the automatic drain valve opens to discharge the dirt to the designated treatment area.

[0027] The vacuum generator creates a stable negative pressure environment under the nozzle. When the high-pressure water washes the dirt on the dry net, the dirt is quickly sucked into the collection pipe under the action of negative pressure and then transferred to the dirt collection box. The adaptive pressure regulating device adjusts the working parameters of the vacuum generator in real time according to the pressure changes in the collection pipe and the amount of dirt sucked in to ensure stable suction.

[0028] Working principle: The dryer mesh runs on the paper machine, and the high-pressure cleaning water flow sent from the high-pressure water pump is sprayed onto the dryer mesh through a nozzle at a certain angle, and the impurities deposited and blocked on the dryer mesh are washed with high pressure. The detached dirt is sucked in and discharged by the dirt collection and drainage module under the nozzle; the cleaning effect of the dryer mesh is detected by the detection module, and the data is fed back to the control module, which adjusts the spray angle of the nozzle, the output pressure and flow of the water pump, so as to realize real-time monitoring and automatic adjustment of the cleaning process, ensure the cleaning effect while reducing energy consumption; the use of this system can not only improve the cleaning efficiency, but also save energy, thereby achieving the purpose of improving the air permeability of the dryer mesh, paper quality and the service life of the dryer mesh.

[0029] Embodiment 2, as Figure 1 As shown, the present invention also proposes a method for cleaning a papermaking dryer fabric, which includes the following steps.

[0030] First, a water pump is used to generate a flushing water flow, which is sprayed toward the dry net through a nozzle to continuously flush the impurities deposited and blocked on the dry net; then, a dirt collection and drainage module is arranged under the nozzle to suck in and discharge the dirt separated from the dry net after flushing; at the same time, the cleaning effect parameters of the dry net are detected by the detection module, and the detected data is transmitted to the control module, which adjusts the output pressure and flow of the water pump and the spray angle of the nozzle according to the cleaning effect parameters, and adjusts its suction force according to the dirt suction amount of the dirt collection and drainage module.

[0031] In order to deal with the impurity deposition and blockage on the dryer mesh, a high-pressure flushing water flow is generated by a water pump, and then sprayed to the dryer mesh by a nozzle. After cleaning, the dirt is sucked out and discharged by the dirt collection and drainage module, which improves the drying efficiency, saves energy and reduces consumption, improves the air permeability of the dryer mesh and improves the operating efficiency of the paper machine.

[0032] High-pressure water flow generation steps: With the help of a high-pressure water pump equipped with an intelligent variable frequency speed control device, the pump can automatically and accurately adjust the output pressure within 8-10MPa according to the real-time monitoring data of the degree of dirtiness of the dry net, and its flow rate can be flexibly changed within 30-50L / min. Through efficient and energy-saving power drive, ordinary water flow is stably converted into high-pressure water, ensuring that suitable high-pressure water flow power can be provided for subsequent flushing under different working conditions.

[0033] In paper mills, the dryer mesh used for preliminary forming of paper will come into contact with sticky substances such as fiber pulp, so a pressure of 8-10MPa can ensure the cleaning effect and maintain the normal operation of the dryer mesh. Since dirt is widely distributed and difficult to clean during the papermaking process, a large flow of high-pressure water is required to ensure full coverage and sufficient flushing, and a flow of 30-50L / min can ensure the effective distribution of high-pressure water on a large area of ​​the dryer mesh, improving the cleaning efficiency.

[0034] High-pressure water flushing step: The high-pressure water generated above is sprayed onto the dry net through a special nozzle at an angle of ±60 degrees to the dry net. This nozzle is equipped with a unique multi-layer spiral guide structure, which not only allows the high-pressure water to be sprayed out in a more concentrated and impactful columnar water flow, but also allows the spray angle and coverage of the water flow to be flexibly adjusted according to the material, mesh size and other characteristics of the dry net. During the flushing process, the high-pressure water has an efficient impact on the impurities deposited and blocked on the dry net, and combined with the shear force of the water flow, it prompts the impurities to quickly leave the surface of the dry net.

[0035] Dirt collection and discharge steps: A vacuum system is arranged closely under the nozzle. The vacuum system is equipped with an adaptive pressure regulating device, which can ensure strong and continuous suction according to the amount of dirt sucked in and the pressure changes in the pipeline. After the dirt is sucked in, it is quickly transferred to the collection device with automatic cleaning function through a specific diameter pipe with a smooth inner wall and anti-clogging design. When the collection device reaches the preset capacity, the cleaning program is automatically started to efficiently discharge the dirt from the entire cleaning system to avoid the accumulation of dirt affecting the cleaning efficiency.

[0036] Visual inspection and feedback steps: A visual inspection module is set up behind the dryer net cleaning area. The module is equipped with a high-resolution image acquisition device to collect real-time images of the dryer net surface. The collected images are analyzed through image processing algorithms to identify the residual dirt area, stain type and distribution on the dryer net surface and other cleaning effect parameters.

[0037] System collaborative control steps: Set up a control module (i.e., central control system), which receives pressure and flow data from the high-pressure water pump, working status data of the nozzle, pressure and dirt suction volume data of the vacuum system, and dry net cleaning effect data from visual inspection feedback; based on these data, the entire cleaning process is collaboratively controlled.

[0038] When visual inspection feedback shows that the cleaning effect of a certain area of ​​the dry web does not meet expectations, the control module instructs the high-pressure water pump to adjust the output pressure by 8-10MPa, and at the same time fine-tune the nozzle angle within a range of ±60, so that the high-pressure water can impact the area more accurately; and dynamically adjust the suction force of the vacuum system according to the dirt suction situation to ensure that the dirt can be collected and discharged in time to avoid secondary pollution.

[0039] Through this real-time feedback and optimization mechanism, the working state of the cleaning system can be continuously optimized during the operation of the dry net, achieving the optimal balance between cleaning efficiency and energy consumption, and ensuring that the online cleaning task is completed efficiently without affecting the normal operation of the dry net.

[0040] Furthermore, the nozzles are movable within the range of ±60 degrees in the transverse direction and ±60 degrees in the longitudinal direction relative to the dryer fabric.

[0041] The transverse angle refers to the angle of the nozzle on the horizontal plane relative to the running direction of the dryer mesh. For example, when the dryer mesh moves horizontally, if the nozzle is perpendicular to the running direction of the dryer mesh, the transverse angle is 90 degrees; if there is a certain inclination with the running direction, such as 45 degrees, then this 45 degrees is the transverse angle. It affects the coverage and flushing trajectory of high-pressure water on the surface of the dryer mesh. The appropriate transverse angle can ensure that all horizontal areas of the dryer mesh are effectively flushed.

[0042] The longitudinal angle is the angle formed by the nozzle in the vertical plane and the plane where the dry net is located. This angle is the key angle that affects the impact force of high-pressure water and the dirt stripping effect. These two angles work together to determine the flushing effect of high-pressure water on the dry net.

[0043] In most scenarios, 30-60 degrees is more commonly used. For some meshes with dense materials and strong dirt adhesion, an angle of 45-60 degrees can allow high-pressure water to impact the dirt obliquely with greater impact force, and use the shear force of the water flow to more effectively remove the dirt. When cleaning some dense paper dry meshes, an angle of about 50 degrees can significantly improve the cleaning effect. For dry meshes with softer materials and easily damaged, an angle of 30-45 degrees is more appropriate, which can not only ensure a certain cleaning force, but also avoid excessive impact damage to the dry mesh caused by high-pressure water.

[0044] In summary, the present invention proposes a cleaning method and system for a papermaking dryer fabric. In order to address the impurity deposition and blockage on the dryer fabric, a high-pressure flushing water flow is generated by a water pump, which is then sprayed toward the dryer fabric through a nozzle. After cleaning, the water is sucked in and discharged by a dirt collection and drainage module, thereby improving the drying efficiency, saving energy and reducing consumption, and improving the air permeability of the dryer fabric while improving the operating efficiency of the paper machine. The cleaning effect of the dryer fabric is detected by a detection module, and the data is fed back to a control module, which adjusts the spray angle of the nozzle, the output pressure and flow of the water pump through the control module, so as to realize real-time monitoring and automatic adjustment of the cleaning process, thereby ensuring the cleaning effect while reducing energy consumption. Furthermore, the system parameters can be flexibly adjusted according to different dryer fabric materials, dirtiness and working environment, thereby improving the versatility of the technology. In addition, the components of the cleaning system adopt a modular design, which is easy to install, maintain and replace, thereby helping to reduce maintenance costs.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0047] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for cleaning a papermaking dryer fabric, characterized in that: The method comprises the following steps: firstly, a water pump is used to generate a flushing water flow, and the flushing water flow is sprayed toward the drying net through a nozzle to continuously flush the impurities deposited and blocked on the drying net; Then, the dirt separated from the dry net after flushing is sucked in and discharged through the dirt collection and drainage module arranged under the nozzle; at the same time, the cleaning effect parameters of the dry net are detected by the detection module, and the detected data is transmitted to the control module. The control module adjusts the output pressure and flow of the water pump and the spray angle of the nozzle according to the cleaning effect parameters, and adjusts its suction force according to the dirt suction amount of the dirt collection and drainage module.

2. The method for cleaning a papermaking dryer fabric according to claim 1, characterized in that: The cleaning effect parameters include the residual dirt area, the type of dirt and the distribution position.

3. The method for cleaning a papermaking dryer fabric according to claim 1, characterized in that: The nozzle is movable within the range of ±60 degrees in the transverse direction and ±60 degrees in the longitudinal direction relative to the dryer fabric.

4. The method for cleaning a papermaking dryer fabric according to claim 1, characterized in that: The output pressure range of the water pump is 8-10MPa, and the output flow range of the water pump is 30-50L / min.

5. A papermaking dryer fabric cleaning system, used to perform the papermaking dryer fabric cleaning method according to any one of claims 1 to 4, characterized in that: It includes a water pump, a nozzle, a dirt collection and drainage module, a detection module and a control module. The nozzle is arranged on one side of the dry net, the dirt collection and drainage module is arranged below the nozzle, the detection module is located behind the dry net cleaning area, and the water pump, the nozzle, the dirt collection and drainage module and the detection module are all connected to the control module.

6. The papermaking dryer fabric cleaning system according to claim 5, characterized in that: The nozzles are provided in 5 to 10 numbers and are distributed in a straight line on one side of the drying net.

7. The papermaking dryer fabric cleaning system according to claim 5, characterized in that: The dirt collection and drainage module comprises a collection pipe, a vacuum system and a collection device, and the collection pipe is located below the nozzle.

8. The papermaking dryer fabric cleaning system according to claim 5, characterized in that: The detection module adopts visual detection equipment.

Images